I am very pleased that you liked the envelope (the first time I did a paper envelope))).It is said that the Russian language is difficult to learn, but you can start with a simple example - Zdrastvuyte (Hello))))

Yes, I think that the most important difficulty would be to learn the cyrillic alphabet... But I've heard that German is also considered as a difficult language, but, for me who is French, I had no difficulty to speak... I hope it will be the same for Russian !